Tapatalk problems

So, I've had problems with accessing the site via tapatalk for over a year. I recently just tried to re-download the app to my iPhone to see if the problem had been solved, but it has not. Whenever I try to sign in after 'add'ing avsim on tapatalk, I get an "Access Denied: this forum is not available, please try again later" error message. Is this a tapatalk problem, or an avsim problem? Is avsim no longer available on tapatalk?